blocks|key|644762|text|有人帮我做了这件事，我只是路过|type|unstyled|depth|inlineStyleRanges|entityRanges|data|644763|-+(void)application:(UIApplication+*)application+didRegisterForRemoteNotificationsWithDeviceToken:(NSData+*)devToken+{

++++const+unsigned+*tokenBytes+=+[deviceToken+bytes];
++++NSString+*hexToken+=+[NSString+stringWithFormat:@"%2508x%2508x%2508x%2508x%2508x%2508x%2508x%2508x",
+++++++++++++++++++++++++ntohl(tokenBytes[0]),+ntohl(tokenBytes[1]),+ntohl(tokenBytes[2]),
+++++++++++++++++++++++++ntohl(tokenBytes[3]),+ntohl(tokenBytes[4]),+ntohl(tokenBytes[5]),
+++++++++++++++++++++++++ntohl(tokenBytes[6]),+ntohl(tokenBytes[7])];

++++[[MyModel+sharedModel]+setApnsToken:hexToken];
}|code-block|syntax|javascript|644764|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Someone Helped me with this.I am just passing along

<pre><code>- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)devToken {

 const unsigned *tokenBytes = [deviceToken bytes];
 NSString *hexToken = [NSString stringWithFormat:@"%08x%08x%08x%08x%08x%08x%08x%08x",
 ntohl(tokenBytes[0]), ntohl(tokenBytes[1]), ntohl(tokenBytes[2]),
 ntohl(tokenBytes[3]), ntohl(tokenBytes[4]), ntohl(tokenBytes[5]),
 ntohl(tokenBytes[6]), ntohl(tokenBytes[7])];

 [[MyModel sharedModel] setApnsToken:hexToken];
}
</code></pre>

blocks|key|430202|text|除非数据以null结尾，否则请尝试此方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430203|NSString*+newStr+=+[[NSString+alloc]+initWithData:newDeviceToken++++++++++++++++++++++++++++++++++++++++++encoding:NSUTF8StringEncoding];|offset|length|style|CODE|430204|entityMap^0|0|0|3T|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Try this one unless the data is null-terminated.

<code>NSString* newStr = [[NSString alloc] initWithData:newDeviceToken
 encoding:NSUTF8StringEncoding];</code>

blocks|key|430236|text|NSString+*tokenstring+=+[[NSString+alloc]+initWithData:token+encoding:NSUTF8StringEncoding];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|430237|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>NSString *tokenstring = [[NSString alloc] initWithData:token encoding:NSUTF8StringEncoding];
</code></pre>

blocks|key|430253|text|你可以用这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430254|-+(NSString+*)stringWithDeviceToken:(NSData+*)deviceToken+{
++++const+char+*data+=+[deviceToken+bytes];
++++NSMutableString+*token+=+[NSMutableString+string];

++++for+(NSUInteger+i+=+0;+i+<+[deviceToken+length];+i%2B%2B)+{
++++++++[token+appendFormat:@"%2502.2hhX",+data[i]];
++++}

++++return+[token+copy];
}|code-block|syntax|javascript|430255|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You could use this 

<pre><code>- (NSString *)stringWithDeviceToken:(NSData *)deviceToken {
 const char *data = [deviceToken bytes];
 NSMutableString *token = [NSMutableString string];

 for (NSUInteger i = 0; i &lt; [deviceToken length]; i++) {
 [token appendFormat:@"%02.2hhX", data[i]];
 }

 return [token copy];
}
</code></pre>

blocks|key|644844|text|-(NSString+*)deviceTokenWithData:(NSData+*)data
{
++++NSString+*deviceToken+=+[[data+description]+stringByTrimmingCharactersInSet:[NSCharacterSet+characterSetWithCharactersInString:@"<>"]];
++++deviceToken+=+[deviceToken+stringByReplacingOccurrencesOfString:@"+"+withString:@""];
++++return+deviceToken;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|644845|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>-(NSString *)deviceTokenWithData:(NSData *)data
{
 NSString *deviceToken = [[data description] stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"&lt;&gt;"]];
 deviceToken = [deviceToken stringByReplacingOccurrencesOfString:@" " withString:@""];
 return deviceToken;
}
</code></pre>

blocks|key|430326|text|如果有人正在寻找在Swift中做到这一点的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430327|Swift+3引入了具有值语义的Data类型。要将deviceToken转换为字符串，可以执行以下操作：|offset|length|style|CODE|430328|func+application(_+application:+UIApplication,+didRegisterForRemoteNotificationsWithDeviceToken+deviceToken:+Data)+{
++++let+token+=+deviceToken.map+{+String(format:+"%2502.2hhx",+$0)+}.joined()
++++print(token)
}|code-block|syntax|javascript|430329|使用NSData的旧答案|430330|func+application(application:+UIApplication,+didRegisterForRemoteNotificationsWithDeviceToken+deviceToken:+NSData)+{
++++let+tokenChars+=+UnsafePointer<CChar>(deviceToken.bytes)
++++var+tokenString+=+""

++++for+i+in+0..<deviceToken.length+{
++++++++tokenString+%2B=+String(format:+"%2502.2hhx",+arguments:+[tokenChars[i]])
++++}

++++print("tokenString:+\(tokenString)")
}|430331|entityMap^0|0|G|4|P|B|0|0|2|6|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]|$D|W|E|X|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|Y|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|12|8|@]|9|@]|A|$K|L]]|$1|Q|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|R|$]]

If anyone is looking for a way to do this in Swift:
Swift 3 introduces the <code>Data</code> type, with value semantics. To convert the <code>deviceToken</code> to a String, you can do as follows:
<pre><code>func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
 let token = deviceToken.map { String(format: &quot;%02.2hhx&quot;, $0) }.joined()
 print(token)
}
</code></pre>
Old answer using <code>NSData</code>:
<pre><code>func application(application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {
 let tokenChars = UnsafePointer&lt;CChar&gt;(deviceToken.bytes)
 var tokenString = &quot;&quot;

 for i in 0..&lt;deviceToken.length {
 tokenString += String(format: &quot;%02.2hhx&quot;, arguments: [tokenChars[i]])
 }

 print(&quot;tokenString: \(tokenString)&quot;)
}
</code></pre>

blocks|key|644906|text|var+token:+String+=+""
for+i+in+0..<deviceToken.count+{
++++token+%2B=+String(format:+"%2502.2hhx",+deviceToken[i]+as+CVarArg)
}

print(token)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|644907|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>var token: String = ""
for i in 0..&lt;deviceToken.count {
 token += String(format: "%02.2hhx", deviceToken[i] as CVarArg)
}

print(token)
</code></pre>

blocks|key|644969|text|这是一个稍微短一点的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|644970|NSData+*token+=+//+...
const+uint64_t+*tokenBytes+=+token.bytes;
NSString+*hex+=+[NSString+stringWithFormat:@"%25016llx%25016llx%25016llx%25016llx",
+++++++++++++++++ntohll(tokenBytes[0]),+ntohll(tokenBytes[1]),
+++++++++++++++++ntohll(tokenBytes[2]),+ntohll(tokenBytes[3])];|code-block|syntax|javascript|644971|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is a little bit shorter solution:

<pre><code>NSData *token = // ...
const uint64_t *tokenBytes = token.bytes;
NSString *hex = [NSString stringWithFormat:@"%016llx%016llx%016llx%016llx",
 ntohll(tokenBytes[0]), ntohll(tokenBytes[1]),
 ntohll(tokenBytes[2]), ntohll(tokenBytes[3])];
</code></pre>

blocks|key|644987|text|NSString+*tokenString+=+[[newDeviceToken+description]+stringByReplacingOccurrencesOfString:@"[<>+]"+withString:@""+options:NSRegularExpressionSearch+range:NSMakeRange(0,+[[newDeviceToken+description]+length])];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|644988|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>NSString *tokenString = [[newDeviceToken description] stringByReplacingOccurrencesOfString:@"[&lt;&gt; ]" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, [[newDeviceToken description] length])];
</code></pre>

blocks|key|430413|text|对于Swift：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430414|var+characterSet:+NSCharacterSet+=+NSCharacterSet(+charactersInString:+"<>"+)
++++var+deviceTokenString:+String+=+(+deviceToken.description+as+NSString+)
++++.stringByTrimmingCharactersInSet(+characterSet+)
++++.stringByReplacingOccurrencesOfString(+"+",+withString:+""+)+as+String

println(+deviceTokenString+)|code-block|syntax|javascript|430415|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For Swift :

<pre><code>var characterSet: NSCharacterSet = NSCharacterSet( charactersInString: "&lt;&gt;" )
 var deviceTokenString: String = ( deviceToken.description as NSString )
 .stringByTrimmingCharactersInSet( characterSet )
 .stringByReplacingOccurrencesOfString( " ", withString: "" ) as String

println( deviceTokenString )
</code></pre>

blocks|key|645052|text|Swift：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|645053|let+tokenString+=+deviceToken.description.stringByReplacingOccurrencesOfString("[+<>]",+withString:+"",+options:+.RegularExpressionSearch,+range:+nil)|code-block|syntax|javascript|645054|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Swift:

<pre><code>let tokenString = deviceToken.description.stringByReplacingOccurrencesOfString("[ &lt;&gt;]", withString: "", options: .RegularExpressionSearch, range: nil)
</code></pre>

blocks|key|430475|text|单行解决方案如何？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430476|目标C|430477|NSString+*token+=+[[data.description+componentsSeparatedByCharactersInSet:[[NSCharacterSet+alphanumericCharacterSet]invertedSet]]componentsJoinedByString:@""];|code-block|syntax|javascript|430478|斯威夫特|430479|let+token+=+data.description.components(separatedBy:+CharacterSet.alphanumerics.inverted).joined()|430480|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

What about one line solution?
Objective C
<pre><code>NSString *token = [[data.description componentsSeparatedByCharactersInSet:[[NSCharacterSet alphanumericCharacterSet]invertedSet]]componentsJoinedByString:@&quot;&quot;];
</code></pre>
Swift
<pre><code>let token = data.description.components(separatedBy: CharacterSet.alphanumerics.inverted).joined()
</code></pre>

blocks|key|645119|text|斯威夫特|type|unstyled|depth|inlineStyleRanges|entityRanges|data|645120|++++//+make+sure+that+we+have+token+for+the+devie+on+the+App
++++func+application(application:+UIApplication
++++++++,+didRegisterForRemoteNotificationsWithDeviceToken+deviceToken:+NSData)+{

++++++++++++var+tokenStr+=+deviceToken.description
++++++++++++tokenStr+=+tokenStr.stringByReplacingOccurrencesOfString("<",+withString:+"",+options:+[],+range:+nil)
++++++++++++tokenStr+=+tokenStr.stringByReplacingOccurrencesOfString(">",+withString:+"",+options:+[],+range:+nil)
++++++++++++tokenStr+=+tokenStr.stringByReplacingOccurrencesOfString("+",+withString:+"",+options:+[],+range:+nil)



++++++++++++print("my+token+is:+\(tokenStr)")

++++}|code-block|syntax|javascript|645121|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Swift 

<pre><code> // make sure that we have token for the devie on the App
 func application(application: UIApplication
 , didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {

 var tokenStr = deviceToken.description
 tokenStr = tokenStr.stringByReplacingOccurrencesOfString("&lt;", withString: "", options: [], range: nil)
 tokenStr = tokenStr.stringByReplacingOccurrencesOfString("&gt;", withString: "", options: [], range: nil)
 tokenStr = tokenStr.stringByReplacingOccurrencesOfString(" ", withString: "", options: [], range: nil)



 print("my token is: \(tokenStr)")

 }
</code></pre>

blocks|key|430620|text|使用优秀的分类！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430621|//+.h文件|430622|@interface+NSData+(DeviceToken)

-+(NSString+*)stringDeviceToken;

@end++++|code-block|syntax|javascript|430623|//+.m文件|430624|#import+"NSData%2BDeviceToken.h"

@implementation+NSData+(DeviceToken)

-+(NSString+*)stringDeviceToken+{
++++const+unsigned+*deviceTokenBytes+=+[deviceToken+bytes];
++++NSString+*deviceToken+=+[NSString+stringWithFormat:@"%2508x%2508x%2508x%2508x%2508x%2508x%2508x%2508x",
+++++++++++++++++++++ntohl(deviceTokenBytes[0]),+ntohl(deviceTokenBytes[1]),+ntohl(deviceTokenBytes[2]),
+++++++++++++++++++++ntohl(deviceTokenBytes[3]),+ntohl(deviceTokenBytes[4]),+ntohl(deviceTokenBytes[5]),
+++++++++++++++++++++ntohl(deviceTokenBytes[6]),+ntohl(deviceTokenBytes[7])];
++++return+deviceToken;
}|430625|@end|430626|//+AppDelegate.m|430627|#import+"NSData%2BDeviceToken.h"

-+(void)application:(UIApplication+*)application+didRegisterForRemoteNotificationsWithDeviceToken:(NSData+*)deviceToken
{
++++NSString+*token+=+deviceToken.stringDeviceToken;
}|430628|工作正常！|430629|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|F|7|13|8|@]|9|@]|A|$G|H]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

Use excellent category!

// .h file

<pre><code>@interface NSData (DeviceToken)

- (NSString *)stringDeviceToken;

@end 
</code></pre>

// .m file

<pre><code>#import "NSData+DeviceToken.h"

@implementation NSData (DeviceToken)

- (NSString *)stringDeviceToken {
 const unsigned *deviceTokenBytes = [deviceToken bytes];
 NSString *deviceToken = [NSString stringWithFormat:@"%08x%08x%08x%08x%08x%08x%08x%08x",
 ntohl(deviceTokenBytes[0]), ntohl(deviceTokenBytes[1]), ntohl(deviceTokenBytes[2]),
 ntohl(deviceTokenBytes[3]), ntohl(deviceTokenBytes[4]), ntohl(deviceTokenBytes[5]),
 ntohl(deviceTokenBytes[6]), ntohl(deviceTokenBytes[7])];
 return deviceToken;
}
</code></pre>

@end

// AppDelegate.m

<pre><code>#import "NSData+DeviceToken.h"

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
 NSString *token = deviceToken.stringDeviceToken;
}
</code></pre>

Works fine!

blocks|key|645291|text|把我的答案扔到垃圾堆上。避免使用字符串解析；文档并不能保证NSData.description总是以这种方式工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|645292|Swift+3实施：|645293|extension+Data+{
++++func+hexString()+->+String+{
++++++++var+bytesPointer:+UnsafeBufferPointer<UInt8>+=+UnsafeBufferPointer(start:+nil,+count:+0)
++++++++self.withUnsafeBytes+{+(bytes)+in
++++++++++++bytesPointer+=+UnsafeBufferPointer<UInt8>(start:+UnsafePointer(bytes),+count:self.count)
++++++++}
++++++++let+hexBytes+=+bytesPointer.map+{+return+String(format:+"%2502hhx",+$0)+}
++++++++return+hexBytes.joined()
++++}
}|code-block|syntax|javascript|645294|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Throwing my answer on the pile. Avoid using string parsing; It's not guaranteed by the docs that NSData.description will always work that way.

Swift 3 Implementation:

<pre><code>extension Data {
 func hexString() -&gt; String {
 var bytesPointer: UnsafeBufferPointer&lt;UInt8&gt; = UnsafeBufferPointer(start: nil, count: 0)
 self.withUnsafeBytes { (bytes) in
 bytesPointer = UnsafeBufferPointer&lt;UInt8&gt;(start: UnsafePointer(bytes), count:self.count)
 }
 let hexBytes = bytesPointer.map { return String(format: "%02hhx", $0) }
 return hexBytes.joined()
 }
}
</code></pre>

blocks|key|645309|text|我尝试用格式"%2502.2hhx"和"%2502x"测试两种不同的方法|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|645310|++++var+i+:Int+=+0
++++var+j:+Int+=+0
++++let+e:+Int+=+Int(1e4)
++++let+time+=+NSDate.timeIntervalSinceReferenceDate
++++while+i+<+e+{
++++++++_+=++deviceToken.map+{+String(format:+"%2502x",+$0)+}.joined()
++++++++i+%2B=+1
++++}
++++let+time2+=+NSDate.timeIntervalSinceReferenceDate
++++let+delta+=+time2-time
++++print(delta)

++++let+time3+=+NSDate.timeIntervalSinceReferenceDate
++++while+j+<+e+{
++++++++_+=++deviceToken.reduce("",+{$0+%2B+String(format:+"%2502x",+$1)})
++++++++j+%2B=+1
++++}
++++let+time4+=+NSDate.timeIntervalSinceReferenceDate
++++let+delta2+=+time4-time3
++++print(delta2)|code-block|syntax|javascript|645311|结果是，最快的是"%2502x"，平均为2.0，而精简版本为2.6：|645312|deviceToken.reduce("",+{$0+%2B+String(format:+"%2502x",+$1)})|645313|entityMap^0|6|A|H|6|0|0|8|6|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

I've tried to test two different methods with format <code>"%02.2hhx"</code> and <code>"%02x"</code>

<pre><code> var i :Int = 0
 var j: Int = 0
 let e: Int = Int(1e4)
 let time = NSDate.timeIntervalSinceReferenceDate
 while i &lt; e {
 _ = deviceToken.map { String(format: "%02x", $0) }.joined()
 i += 1
 }
 let time2 = NSDate.timeIntervalSinceReferenceDate
 let delta = time2-time
 print(delta)

 let time3 = NSDate.timeIntervalSinceReferenceDate
 while j &lt; e {
 _ = deviceToken.reduce("", {$0 + String(format: "%02x", $1)})
 j += 1
 }
 let time4 = NSDate.timeIntervalSinceReferenceDate
 let delta2 = time4-time3
 print(delta2)
</code></pre>

and the result is that the fastest is <code>"%02x"</code> at average 2.0 vs 2.6 for the reduced version:

<pre><code>deviceToken.reduce("", {$0 + String(format: "%02x", $1)})
</code></pre>

blocks|key|430697|text|下面是如何在Xamarin.iOS中执行此操作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430698|public+override+void+RegisteredForRemoteNotifications(UIApplication+application,+NSData+deviceToken)
{
++++var+tokenStringBase64+=+deviceToken.GetBase64EncodedString(NSDataBase64EncodingOptions.None);
++++//now+you+can+store+it+for+later+use+in+local+storage
}|code-block|syntax|javascript|430699|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here's how you do it in Xamarin.iOS

<pre><code>public override void RegisteredForRemoteNotifications(UIApplication application, NSData deviceToken)
{
 var tokenStringBase64 = deviceToken.GetBase64EncodedString(NSDataBase64EncodingOptions.None);
 //now you can store it for later use in local storage
}
</code></pre>

blocks|key|430736|text|@kulss在这里发布的解决方案，虽然缺乏优雅，但具有简单的优点，不再适用于iOS+13，因为description将以不同的方式在NSData中工作。不过，您仍然可以使用debugDescription。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|430737|NSString+*+deviceTokenString+=+[[[[deviceToken+debugDescription]
+++++++++++++++++++++stringByReplacingOccurrencesOfString:+@"<"+withString:+@""]+
++++++++++++++++++++stringByReplacingOccurrencesOfString:+@">"+withString:+@""]+
+++++++++++++++++++stringByReplacingOccurrencesOfString:+@"+"+withString:+@""];|code-block|syntax|javascript|430738|entityMap^0|1B|B|2E|G|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

The solution @kulss posted here, while lacking in elegance but having the virtue of simplicity no longer works in iOS 13, since <code>description</code> will work differently for NSData. You can still use <code>debugDescription</code> though.

<pre><code>NSString * deviceTokenString = [[[[deviceToken debugDescription]
 stringByReplacingOccurrencesOfString: @"&lt;" withString: @""] 
 stringByReplacingOccurrencesOfString: @"&gt;" withString: @""] 
 stringByReplacingOccurrencesOfString: @" " withString: @""];
</code></pre>

blocks|key|430773|text|在iOS+13中，描述将采用不同的格式。请使用以下代码来获取设备令牌。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430774|-+(NSString+*)fetchDeviceToken:(NSData+*)deviceToken+{
++++NSUInteger+len+=+deviceToken.length;
++++if+(len+==+0)+{
++++++++return+nil;
++++}
++++const+unsigned+char+*buffer+=+deviceToken.bytes;
++++NSMutableString+*hexString++=+[NSMutableString+stringWithCapacity:(len+*+2)];
++++for+(int+i+=+0;+i+<+len;+%2B%2Bi)+{
++++++++[hexString+appendFormat:@"%2502x",+buffer[i]];
++++}
++++return+[hexString+copy];
}|code-block|syntax|javascript|430775|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In iOS 13 the description will be in different format. Kindly use below code to fetch the device token.
<pre><code>- (NSString *)fetchDeviceToken:(NSData *)deviceToken {
 NSUInteger len = deviceToken.length;
 if (len == 0) {
 return nil;
 }
 const unsigned char *buffer = deviceToken.bytes;
 NSMutableString *hexString = [NSMutableString stringWithCapacity:(len * 2)];
 for (int i = 0; i &lt; len; ++i) {
 [hexString appendFormat:@&quot;%02x&quot;, buffer[i]];
 }
 return [hexString copy];
}
</code></pre>

blocks|key|430825|text|2020年|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430826|文本形式的令牌...|430827|let+tat+=+deviceToken.map{+data+in+String(format:+"%2502.2hhx",+data)+}.joined()|code-block|syntax|javascript|430828|或者如果你喜欢|430829|let+tat2+=+deviceToken.map+{+String(format:+"%2502.2hhx",+$0)+}.joined()|430830|(结果相同)|430831|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

<h1>2020</h1>
token as text...
<pre><code>let tat = deviceToken.map{ data in String(format: &quot;%02.2hhx&quot;, data) }.joined()
</code></pre>
or if you prefer
<pre><code>let tat2 = deviceToken.map { String(format: &quot;%02.2hhx&quot;, $0) }.joined()
</code></pre>
(result is the same)

blocks|key|430866|text|这对你很有效，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430867|NSUInteger+dataLength+=+deviceToken.length;
++++
const+unsigned+char+*dataBuffer+=+(const+unsigned+char+*)deviceToken.bytes;
NSMutableString+*deviceTokenString+=+[NSMutableString+stringWithCapacity:(dataLength+*+2)];
for+(int+i+=+0;+i+<+dataLength;+%2B%2Bi)+{
++++[deviceTokenString+appendFormat:@"%2502x",+dataBuffer[i]];
}
++++
NSLog(@"The+generated+device+token+string+is+:+%25@",deviceTokenString);|code-block|syntax|javascript|430868|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This will work for you,
<pre><code>NSUInteger dataLength = deviceToken.length;
 
const unsigned char *dataBuffer = (const unsigned char *)deviceToken.bytes;
NSMutableString *deviceTokenString = [NSMutableString stringWithCapacity:(dataLength * 2)];
for (int i = 0; i &lt; dataLength; ++i) {
 [deviceTokenString appendFormat:@&quot;%02x&quot;, dataBuffer[i]];
}
 
NSLog(@&quot;The generated device token string is : %@&quot;,deviceTokenString);
</code></pre>

I am implementing push notifications. I'd like to save my APNS Token as a String.

<pre><code>- (void)application:(UIApplication *)application
didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)newDeviceToken
{
 NSString *tokenString = [NSString stringWithUTF8String:[newDeviceToken bytes]]; //[[NSString alloc]initWithData:newDeviceToken encoding:NSUTF8StringEncoding];
 NSLog(@"%@", tokenString);
 NSLog(@"%@", newDeviceToken);
}
</code></pre>

The first line of code prints null. the second prints the token. How can I get my newDeviceToken as an NSString?

How can I convert my device token (NSData) into an NSString?

Xamarin

Swift

我正在实现推送通知。我想将我的APNS令牌保存为字符串。- (void)application:(UIApplication *)applicationdidRegisterForRemoteNotificationsWithDeviceToken:(NSData *)newDeviceToken{    NSStri...

问如何将设备令牌(NSData)转换为NSString？
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